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A Spherical Nano-zno/zncr with Efficient Hydrogen Production 2 o 4 Preparation method of composite photocatalyst

A composite photocatalysis and photocatalyst technology, which is applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of the small number of heterogeneous nodes and the agglomeration of photocatalysts , Photocatalytic activity is limited to increase and other issues, to achieve the effect of increasing heterojunction, increasing specific surface area, controlling grain growth and uniformity

Inactive Publication Date: 2019-08-27
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, a single preparation method tends to rapidly precipitate hydroxides, and the obtained photocatalysts are prone to agglomeration, and the number of heterogeneous nodes is small, so the improvement of photocatalytic activity is limited.

Method used

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  • A Spherical Nano-zno/zncr with Efficient Hydrogen Production <sub>2</sub> o <sub>4</sub> Preparation method of composite photocatalyst
  • A Spherical Nano-zno/zncr with Efficient Hydrogen Production <sub>2</sub> o <sub>4</sub> Preparation method of composite photocatalyst
  • A Spherical Nano-zno/zncr with Efficient Hydrogen Production <sub>2</sub> o <sub>4</sub> Preparation method of composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 0.04mol zinc nitrate and 0.02mol chromium nitrate and add them to deionized water, stir magnetically until completely dissolved to form a mixed nitrate solution, and the total concentration of metal ions is controlled within 0.1mol / L;

[0029] (2) Take by weighing 0.22g small molecule waxy substance and add in the mixed nitrate solution that step (1) makes as dispersant, add 0.56 g urea to dissolve completely under magnetic stirring;

[0030] (3) Transfer the reaction mixture obtained in (2) into a round bottom flask, reflux at 120 °C for 4 h under magnetic stirring, and then stand at the same temperature for 4 h to obtain the microcrystalline precursor;

[0031] (4) Transfer the precursor obtained in (3) to a hydrothermal reactor for hydrothermal aging reaction. The hydrothermal aging temperature is 120 °C, the reaction time is 8 h, and the reactants are naturally cooled to room temperature;

[0032] (5) The reaction product obtained in step (4) was subjected...

Embodiment 2

[0035] (1) Weigh 0.06mol of zinc nitrate and 0.02mol of chromium nitrate and add them into ionized water, stir magnetically until completely dissolved to form a mixed nitrate solution, and the total concentration of metal ions is controlled within 0.1mol / L;

[0036] (2) Take by weighing 0.44g small molecule waxy substance and add in the mixed nitrate solution that step (1) makes as dispersant, add 0.79 g urea to dissolve completely under magnetic stirring;

[0037] (3) Transfer the reaction mixture obtained in (2) into a round bottom flask, reflux at 110 °C for 6 h under magnetic stirring, and then stand at the same temperature for 6 h to obtain a microcrystalline precursor;

[0038] (4) Transfer the precursor obtained in (3) to a hydrothermal reaction kettle for hydrothermal aging reaction. The hydrothermal aging temperature is 110°C, the reaction time is 12h, and the reactants are naturally cooled to room temperature;

[0039] (5) Vacuum filter the reaction product obtained ...

Embodiment 3

[0042] (1) Weigh 0.08mol of zinc nitrate and 0.03mol of chromium nitrate into deionized water, stir magnetically until completely dissolved to form a mixed nitrate solution, and the total concentration of metal ions is controlled within 0.1mol / L;

[0043] (2) Take by weighing 0.66g small molecule waxy substance and add in the mixed nitrate solution that step (1) makes as dispersant, add 1.12 g urea to dissolve completely under magnetic stirring;

[0044] (3) Transfer the reaction mixture obtained in (2) into a round-bottomed flask, reflux at 100 °C for 8 h under magnetic stirring, and then stand at the same temperature for 10 h to obtain a microcrystalline precursor;

[0045] (4) Transfer the precursor obtained in (3) to a hydrothermal reactor for hydrothermal aging reaction. The hydrothermal aging temperature is 120 °C, the reaction time is 8 h, and the reactants are naturally cooled to room temperature;

[0046] (5) Vacuum filter the reaction product obtained in step (4), wa...

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Abstract

The invention discloses a preparation method of a spherical nanometer ZnO / ZnCr2O4 composite photocatalyst capable of producing hydrogen efficiently. The spherical nanometer ZnO / ZnCr2O4 composite photocatalyst capable of producing hydrogen efficiently has excellent photocatalytic hydrogen production performance under the simulated sunlight. The preparation method particularly comprises the following steps: obtaining a microcrystal precursor by controlling the ratio of Zn to Cr to be (1.0-8.0):1.0 under the assisted action of the dispersing agent and by a urea backflow hydrolysis, refluxing at 100 to 130 DEG C for 2 to 8 hours, leaving to stand for 2 to 10 hours, transferring to a ball-milling tank, grinding and transferring to a hydrothermal reaction kettle to perform ageing, washing and drying a product, and performing programmed heating and roasting. Urea hydrolysis refluxing can effectively control hydrolysis of metal ions, ball milling can promote metal hydroxide to be mixed uniformly, heterogeneous nodes are increased, hydrothermal ageing can control growth and uniformity of crystal particles, and the dispersing agent can inhibit particle aggregation. The invention provides a preparation method of a composite photocatalytic material with environmental friendliness, low cost and controllable composition, size and appearance.

Description

technical field [0001] The invention belongs to the technical field of new materials and their preparation, and relates to ZnO / ZnCr with a nano-spherical structure 2 o 4 The preparation method of the inorganic material has good photocatalytic hydrogen production performance under simulated sunlight. Background technique [0002] With the rapid growth of global energy consumption and the continuous reduction of fossil energy, people pay more and more attention to the research of new energy. As a secondary energy source, hydrogen energy has the characteristics of high efficiency, storability, transportability, cleanliness, safety, etc. With the help of sunlight, water is decomposed into hydrogen, and pollutants in water are oxidized or reduced to harmless substances, which has the characteristics of low energy consumption and green. One of the key factors in water splitting is to seek new and efficient photocatalysts. Most of the photocatalysts studied at present have rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26C01B3/04
CPCB01J23/26B01J35/004B01J35/023B01J35/08B01J35/1014B01J35/1019B01J35/1038B01J35/1061C01B3/042C01B2203/1076C01B2203/1088Y02E60/36
Inventor 阎建辉戴超华张丽梁青满周民杰杨鹏
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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